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Pyrophosphate Hydrolysis in Flooded Soil¹

ABSTRACT

Rate of hydrolysis of pyrophosphate, applied as (NH₄)₃-HP₂O₇·H₂O, was measured in four soils under flooded and atm moisture content. Hydrolysis was faster under flooded conditions than at atm moisture. Pyrophosphate hydrolysis was determined to be a first-order reaction under flooded conditions but not at atm moisture content. The first-order rate constants under flooded conditions ranged from 2.09 x 10^-5 min^-1 to 1.43 x 10^-4 min^-1 depending upon the soil and temperature of incubation. Half-life values for applied pyrophosphate varied from 0.6 to 3.9 days. The activation energy for pyrophosphate hydrolysis under flooded soil conditions was calculated to be 4,500 cal/mole for a Katy sl soil.

¹ Contribution from the Soil and Crop Sci. Dept., Texas A & M Univ., College Station, Texas. 77843.

² Associate Professor and Graduate Assistant, Soil and Crop Sciences Department.

Received for publication November 6, 1970. Accepted for publication January 14, 1971.